昆仑山口西8.1级地震前后地壳垂直运动的负位错模型
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摘要
利用昆仑山口西 8 1级地震震区外围格尔木—五道梁 30 0km长水准测线在 1 979,1 991和 2 0 0 2年 3期垂直形变资料 ,借助研究改进的负位错模型获取发震构造及其相关断裂的运动、变形特征及应力应变积累部位和强度 ,对与此次大震有关的区域构造形变背景及可能的震后影响进行了研究。结果表明 :1 991～ 2 0 0 2年相对 1 979～ 1 991年垂直差异运动及应变积累加速增强的特征与昆仑山口西 8 1级地震孕育有关 ;且这样的一个地壳垂直运动加速过程可能还未因地震发生而结束 ,发震构造相关的断裂构造部位仍有发生较强地震的可能
Using the vertical deformation data of the long-leveling survey got respectively in 1979, 1991 and 2002 alongside the 300km-long measuring line which extents from Geermu to Wudaoliang in the outer earthquake area of M S 8 1 earthquake, with the aid of improved negative dislocation model, the following three results are obtained.(1) The motion and deformation of seismogenic fault and the related faults.(2) The location where the stress and strain accumulates.(3) The intensity of the accumulated stress and strain.Further, the regional tectonic deformation background in relation with this earthquake is studied.Then, the following conclusions can be drawn.The vertical crustal movement and strain accumulation in the period from 1991 to 2001 sped up compared with the crustal movement and strain accumulation in the period from 1979 to 1999.This phenomenon is related to the development of M S 8 1 Kunlun Earthquake.And the acceleration process of vertical crustal movement may have not yet finished.So, it is still possible for strong earthquakes to occur on the faults related to the seismogenic structure.
Using the vertical deformation data of the long-leveling survey got respectively in 1979, 1991 and 2002 alongside the 300km-long measuring line which extents from Geermu to Wudaoliang in the outer earthquake area of M S 8 1 earthquake, with the aid of improved negative dislocation model, the following three results are obtained.(1) The motion and deformation of seismogenic fault and the related faults.(2) The location where the stress and strain accumulates.(3) The intensity of the accumulated stress and strain.Further, the regional tectonic deformation background in relation with this earthquake is studied.Then, the following conclusions can be drawn.The vertical crustal movement and strain accumulation in the period from 1991 to 2001 sped up compared with the crustal movement and strain accumulation in the period from 1979 to 1999.This phenomenon is related to the development of M S 8 1 Kunlun Earthquake.And the acceleration process of vertical crustal movement may have not yet finished.So, it is still possible for strong earthquakes to occur on the faults related to the seismogenic structure.
引文
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[11]江在森,张希,王双绪,等.昆仑山口西MS81地震前区域构造变形背景[J].中国科学(d辑)2003(2):163-172.
[12]XuXiwei,ChenWenbin,MaWentao,etal.SurfaceruptureoftheKunlunshanearthquake(MS81),NorthernTibetanPlateau,China[J].SeismologicalResearchLetters,2002,73(6):883-892.
[2]YuShuiBeih,JacksonDD ,YuGueyKuen,etal.DislocationmodelforcrustaldeformationintheLongitudinalValleyarea,easternTaiwan[J].Tectonophysics,1990,183:97-109.
[3]OkadaY .Surfacedeformationduetoshearandtensilefaultsinahalf-space[J].BulletinoftheSeismologicalSocietyofAmerica,1985,75(4):1135-1154.
[4]伍吉仓,陈永奇.一种板块边界断层运动的力学模型[J].地壳形变与地震,2000,20(2):8-14.
[5]何玉梅,姚振兴.中国台湾南部及其周边岛屿现今地壳形变的位错模型[J].地球物理学报,2002,45(5):638-645.
[6]伍吉仓,许才军.利用GPS资料反演华北块体运动的负位错模型参数[J].武汉大学学报(信息科学版),2002,27(4):352-357.
[7]张希,江在森,张晓亮,等.华北地区近期地壳水平运动的非震负位错反演[J].大地测量与地球动力学,2002,22(3):40-45.
[8]张希,江在森,王琪,等.1999～2001年青藏块体东北缘地壳水平运动的非震反位错模型及变形分析[J].地震学报,2003,25(4):374-381.
[9]高锡铭,伍吉仓.负位错模型与断层运动图像—确定滇西地震预报实验区的潜在震源区[J].地壳形变与地震,1994,14(4):1-8.
[10]申重阳,吴云,杨少敏,等.华北地块内部主要断层运动模型的GPS数据反演分析[J].地壳形变与地震,2001,21(4):33-42.
[11]江在森,张希,王双绪,等.昆仑山口西MS81地震前区域构造变形背景[J].中国科学(d辑)2003(2):163-172.
[12]XuXiwei,ChenWenbin,MaWentao,etal.SurfaceruptureoftheKunlunshanearthquake(MS81),NorthernTibetanPlateau,China[J].SeismologicalResearchLetters,2002,73(6):883-892.
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